International Peace Research Association (IPRA)
http://soc.kuleuven.be/
Since 1964 IPRA has been pursuing interdisciplinary research into the most pressing issues related to sustainable peace around the world today. As a network of scholars, practitioners and decision-makers from all continents, we strive to stay at the cutting edge of the state of the art of peace.

International Peace Resarch Network
http://www.prio.no
Founded in 1959, the International Peace Research Institute, Oslo (PRIO) is an independent research institute known for its effective synergy of basic and policy-relevant research. In addition to such research, PRIO conducts graduate training and is engaged in the promotion of peace through conflict resolution, dialogue and reconciliation, public information and policymaking activities.

Peace and Collaborative Development Network
http://www.internationalpeaceandconflict.org
This is a free professional networking site (with over 13,680 members from around the world) to foster dialogue and sharing of resources in international development, conflict resolution, gender mainstreaming, human rights, social entrepreneurship and related fields.